The woolly and long chips with coolant content to be crushed are fed with a conveyor or chip cart dumper into the infeed hopper of the chip crusher. A rotating knife head with hardened crushing tools moves the complete chip ball against the hardened tearing blocks fixed into the crushing hopper. The precrushed chips fall downwards into the crushing mill, where they are crushed to a minimum size. Tramp metals such as bar ends and tools can be ejected in automatic operation. Even the roughest chips can be crushed with this chip crusher.